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602ba17888
Make the copyable recipe independent of ambient set -e behavior. A failed tmux new-session now reports the failure and exits while session_owned is still false; only a successful creation reaches the ownership assignment. A real collision reproduced the prior snippet killing its sentinel after marking a failed creation as owned. The guarded version preserved the exact sentinel identity, and three refined fresh-agent runs again preserved IDs 17, 18, and 19 while cleaning only their fallback sessions.